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JEE Main & Advanced Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Question Bank Self Evaluation Test - Work, Energy and Power

  • question_answer
    The heart of man pumps 5 liters of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be \[13.6\times 1{{0}^{3}}kg/{{m}^{3}}\]and \[\operatorname{g} = 10m/{{s}^{2}}\]then the power of heart in watt is:

    A) 2.35

    B) 3.0   

    C) 1.50

    D) 1.70

    Correct Answer: D

    Solution :

    [d] Power \[\vec{F}.\vec{V} = PA\vec{V} =\rho ghAV\] \[\left[ \because \frac{F}{A}and\,P=\rho gh \right]\] \[= 13.6\times  1{{0}^{3}}\times  10\times  150\times  1{{0}^{-3}}\times 0.5\times 1{{0}^{-3}}/60\]\[=\frac{102}{60}=1.70\operatorname{watt}\]


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